H8S2245 datasheet(115/818 Pages) RENESAS

115 / 818 page

Section 3 MCU Operating Modes

Rev.3.00 Mar. 26, 2007 Page 73 of 772

REJ09B0355-0300

3.2

3.2.1

Mode Control Register (MDCR)

—

MDS0

—*

MDS2

—*

MDS1

—*

Note: * Determined by pins MD2 to MD0.

Bit

Initial value

R/W

MDCR is an 8-bit read-only register that indicates the current operating mode of the H8S/2245

Group.

Bit 7—Reserved: Read-only bit, always read as 1.

Bits 6 to 3—Reserved: Read-only bits, always read as 0.

Bits 2 to 0—Mode Select 2 to 0 (MDS2 to MDS0): These bits indicate the input levels at pins

2 to MD0 (the current operating mode). Bits MDS2 to MDS0 correspond to MD2 to MD0.

MDS2 to MDS0 are read-only bits-they cannot be written to. The mode pin (MD

2 to MD0) input

levels are latched into these bits when MDCR is read. These latches are canceled by a power-on

reset, but are retained after a manual reset.

3.2.2

System Control Register (SYSCR)

—

R/W

—

INTM1

R/W

INTM0

R/W

NMIEG

R/W

RAME

R/W

—

Bit

Initial value

R/W

SYSCR is an 8-bit readable/writable register that selects the interrupt control mode, the detected

edge for NMI, and enable or disable the on-chip RAM.

SYSCR is initialized to H'01 by a reset and in hardware standby mode. It is not initialized in

software standby mode.

Bit 7—Reserved: This bit can be read or written, but does not affect operation.

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